The "solar constant" s0 ≈ 1.36 kw/m2 (the mean solar radiation intensity felt on earth orbit) is calculated using the mean earth-sun distance. in practice, the actual earth-sun distance deviates from its mean by about ±2%, depending on the time of the year. how much variation would you expect for the actual solar intensity over the course of a year? (15 points)

Air undergoes a constant pressure cooling process with no moisture added or removed. the air originally exists at 45 °c, 150 kpa and 35 % relative humidity. it is cooled until the temperature reaches 29 oc. determine (a) the relative humidity of the cooled air. (b) the dew point temperature of the cooled air in °c. (c) the heat removed during the cooling process in kj/kg. use the psychrometric chart to check your answers (this part will not be graded; however, it will you get comfortable using the psychrometric chart)